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Optimal mixed convection for maximal energy recovery with vertical porous channel (solar wall)

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  • Boutin, Yanik
  • Gosselin, Louis

Abstract

A vertical open-ended channel filled with a porous medium, with an imposed heat flux and a heat loss coefficient on one of its walls, is studied numerically. A fan can enhance the self-driven flow, and therefore a mixed convection regime is considered. The objective is to maximize the overall energy recovery (heat transfer to the fluid minus fan power). Correlations are developed for optimal pressure drop to be imposed by the fan and maximal energy recovery, as a function of the Rayleigh number, the channel aspect ratio, and the heat loss coefficient. The optimal allocation of the total energy losses (i.e., sum of the heat loss and fan power) is shown. Potential applications include solar wall and solar chimney used for ventilation and preheating of makeup air in buildings.

Suggested Citation

  • Boutin, Yanik & Gosselin, Louis, 2009. "Optimal mixed convection for maximal energy recovery with vertical porous channel (solar wall)," Renewable Energy, Elsevier, vol. 34(12), pages 2714-2721.
    • Handle: RePEc:eee:renene:v:34:y:2009:i:12:p:2714-2721
    DOI: 10.1016/j.renene.2009.06.007
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    References listed on IDEAS

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    1. Nouanégué, H.F. & Alandji, L.R. & Bilgen, E., 2008. "Numerical study of solar-wind tower systems for ventilation of dwellings," Renewable Energy, Elsevier, vol. 33(3), pages 434-443.
    2. Hollick, J.C., 1994. "Unglazed solar wall air heaters," Renewable Energy, Elsevier, vol. 5(1), pages 415-421.
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    Cited by:

    1. Zhou, Guobing & Pang, Mengmeng, 2015. "Experimental investigations on thermal performance of phase change material – Trombe wall system enhanced by delta winglet vortex generators," Energy, Elsevier, vol. 93(P1), pages 758-769.
    2. Quesada, Guillermo & Rousse, Daniel & Dutil, Yvan & Badache, Messaoud & Hallé, Stéphane, 2012. "A comprehensive review of solar facades. Opaque solar facades," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2820-2832.
    3. Dehghan, Maziar & Rahmani, Yousef & Domiri Ganji, Davood & Saedodin, Seyfollah & Valipour, Mohammad Sadegh & Rashidi, Saman, 2015. "Convection–radiation heat transfer in solar heat exchangers filled with a porous medium: Homotopy perturbation method versus numerical analysis," Renewable Energy, Elsevier, vol. 74(C), pages 448-455.
    4. Zhai, X.Q. & Song, Z.P. & Wang, R.Z., 2011. "A review for the applications of solar chimneys in buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 3757-3767.

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